Excavator



FIG. 1 is a top front perspective view of an excavator showing our new design;

FIG. 2 is a top rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a left side view thereof; and,

FIG. 8 is a right side view thereof.

The broken lines in the Figures show environment for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for an excavator, as shown and described. 